def test_decode_format_raises(self):
"""Test decoding using invalid format raises."""
index = get_indexed_datasets('1.2.840.10008.1.2.4.90')
ds = index['693_J2KR.dcm']['ds']
frame = next(generate_frames(ds))
msg = r"Unsupported 'j2k_format' value: 3"
with pytest.raises(ValueError, match=msg):
get_parameters(frame, j2k_format=3)
def test_decode_bad_type_raises(self):
"""Test decoding using invalid type raises."""
index = get_indexed_datasets('1.2.840.10008.1.2.4.90')
ds = index['MR_small_jp2klossless.dcm']['ds']
frame = tuple(next(generate_frames(ds)))
assert not hasattr(frame, 'tell') and not isinstance(frame, bytes)
msg = (
r"The Python object containing the encoded JPEG 2000 data must "
r"either be bytes or have read\(\), tell\(\) and seek\(\) methods."
)
with pytest.raises(TypeError, match=msg):
get_parameters(frame)
def test_jpeg2000i(self, fname, info):
"""Test get_parameters() for the baseline datasets."""
index = get_indexed_datasets('1.2.840.10008.1.2.4.91')
ds = index[fname]['ds']
frame = next(generate_frames(ds))
params = get_parameters(frame)
assert (info[0], info[1]) == (params['rows'], params['columns'])
assert info[2] == params['nr_components']
assert info[3] == params['precision']
assert info[4] == params['is_signed']
def test_data_signed_pr_0(self):
"""Test signed JPEG data with Pixel Representation 0"""
ds = self.ds['TOSHIBA_J2K_SIZ1_PixRep0.dcm']['ds']
assert self.uid == ds.file_meta.TransferSyntaxUID
assert 1 == ds.SamplesPerPixel
assert 1 == getattr(ds, 'NumberOfFrames', 1)
assert 'MONOCHROME' in ds.PhotometricInterpretation
assert 16 == ds.BitsAllocated
assert 16 == ds.BitsStored
assert 0 == ds.PixelRepresentation
#ds.PixelRepresentation = 1
arr = ds.pixel_array
frame = next(generate_frames(ds))
params = get_parameters(frame)
assert params['is_signed'] == True
def test_data_signed_pr_0(self):
"""Test signed JPEG data with Pixel Representation 0"""
ds = self.ds['TOSHIBA_J2K_SIZ1_PixRep0.dcm']['ds']
assert self.uid == ds.file_meta.TransferSyntaxUID
assert 1 == ds.SamplesPerPixel
assert 1 == getattr(ds, 'NumberOfFrames', 1)
assert 'MONOCHROME' in ds.PhotometricInterpretation
assert 16 == ds.BitsAllocated
assert 16 == ds.BitsStored
assert 0 == ds.PixelRepresentation
# Note: if PR is 0 but the JPEG data is signed then... ?
msg = (
r"Pixel Representation value '0' \(unsigned\) in the dataset does "
r"not match the format of the values found in the JPEG 2000 data "
r"'signed'")
with pytest.warns(UserWarning, match=msg):
arr = ds.pixel_array
frame = next(generate_frames(ds))
params = get_parameters(frame)
assert params['is_signed'] == True
def test_data_unsigned_pr_1(self):
"""Test unsigned JPEG data with Pixel Representation 1"""
ds = self.ds['TOSHIBA_J2K_SIZ0_PixRep1.dcm']['ds']
assert self.uid == ds.file_meta.TransferSyntaxUID
assert 1 == ds.SamplesPerPixel
assert 1 == getattr(ds, 'NumberOfFrames', 1)
assert 'MONOCHROME' in ds.PhotometricInterpretation
assert 16 == ds.BitsAllocated
assert 16 == ds.BitsStored
assert 1 == ds.PixelRepresentation
# Note: if PR is 1 but the JPEG data is unsigned then it should
# probably be converted to signed using 2s complement
msg = (
r"Pixel Representation value '1' \(signed\) in the dataset does "
r"not match the format of the values found in the JPEG 2000 data "
r"'unsigned'")
with pytest.warns(UserWarning, match=msg):
arr = ds.pixel_array
frame = next(generate_frames(ds))
params = get_parameters(frame)
assert params['is_signed'] == False
def test_subsampling():
"""Test parameters with subsampled data (see #36)."""
jpg = DIR_15444 / "2KLS" / "oj36.j2k"
params = get_parameters(jpg)
print(params)
def test_bad_decode():
"""Test trying to decode bad data."""
stream = b"\xff\x4f\xff\x51\x00\x00\x01"
msg = r"Error decoding the J2K data: failed to read the header"
with pytest.raises(RuntimeError, match=msg):
get_parameters(stream)